JP2019210408A - Rubber composition and tire - Google Patents

Abstract

To provide a rubber composition excellent in low heat generation, abrasion resistance and processability.SOLUTION: The rubber composition comprises a rubber constituent containing a diene rubber, a filler, a compound represented by the formula (III) in the figure, and multiple fatty acid metal salts respectively having different metals.SELECTED DRAWING: None

Description

  The present invention relates to a rubber composition and a tire.

  In recent years, there has been a strong demand for reducing fuel consumption of automobiles, and tires with low rolling resistance are required. Therefore, as a rubber composition used for a tire tread or the like, a rubber composition having a low tan δ and an excellent low heat generation property is desired.

  In conventional pneumatic tires, for the purpose of realizing low heat build-up, measures such as increasing the particle size of carbon black in the rubber composition or reducing the amount of carbon black can be considered. At the same time, there has been a problem that the wear resistance of the tread rubber is lowered and the fracture resistance such as cut resistance and chipping resistance of the rubber is lowered.

Therefore, it has been desired to develop a technique capable of improving the low heat generation without reducing other physical properties such as wear resistance.
As one of those technologies, for example, Patent Document 1 contains carbon black and a specific hydrazide compound in an elastomer containing natural rubber for the purpose of improving the chemical interaction between the rubber component and carbon black. A rubber composition is disclosed.

Special table 2014-501827 gazette

  However, with the technique disclosed in Patent Document 1, the effect of improving the low heat generation is not sufficient, and further improvement of the low heat generation is necessary to meet the demand for fuel efficiency reduction of automobiles. In addition, when improvement of low heat build-up was attempted by the technique of Patent Document 1, a polymer gel was generated in the rubber composition, and deterioration of processability (increased viscosity) was also considered. Further improvement was desired for sex.

  Therefore, an object of the present invention is to provide a rubber composition excellent in low heat build-up, wear resistance and processability. Another object of the present invention is to provide a tire excellent in low heat generation, wear resistance and productivity.

  The inventors of the present invention have intensively studied to solve the above-described problems with rubber compositions containing a rubber component and a filler. Further, by including a hydrazide compound or hydrazone compound having a specific structure in the rubber composition, the interaction between the rubber component and carbon black can be enhanced, resulting in better low heat generation and wear resistance. We focused on what can be achieved. And about the problem of the workability deterioration resulting from the production | generation of the polymer gel mentioned above, processability improvement is enabled by making the rubber composition contain a plurality of fatty acid metal salts having different metal types. The present inventors have found that it is possible to achieve both excellent low heat buildup and wear resistance and excellent workability, thereby completing the present invention.

（式中、Ｒは、アリール基、置換若しくは無置換のヒダントイン基及び炭素数が１〜２０の飽和若しくは不飽和の直鎖状炭化水素基からなる群より選択される少なくとも一種である。）
上記構成を具えることによって、優れた低発熱性、耐摩耗性及び加工性を実現できる。 That is, the rubber composition of the present invention comprises a rubber component containing a diene rubber, a filler, a compound represented by the following formula (III), and a plurality of fatty acid metal salts each having a different metal type. It is characterized by including.

(In the formula, R is at least one selected from the group consisting of an aryl group, a substituted or unsubstituted hydantoin group, and a saturated or unsaturated linear hydrocarbon group having 1 to 20 carbon atoms.)
By providing the above configuration, it is possible to achieve excellent low heat generation, wear resistance, and workability.

  Moreover, about the rubber composition of this invention, it is preferable that R in the compound represented by said Formula (III) is a phenyl group. This is because more excellent low heat generation and wear resistance can be realized.

  Furthermore, about the rubber composition of this invention, it is preferable that melting | fusing point of the compound represented by said Formula (III) is 80 degreeC or more and less than 250 degreeC. This is because more excellent low heat generation and wear resistance can be realized.

  Moreover, about the rubber composition of this invention, it is preferable that content of the compound represented by said Formula (III) is 0.05-30 mass parts with respect to 100 mass parts of said rubber components. This is because more excellent low heat generation and wear resistance can be realized, and deterioration of workability can be effectively suppressed.

  Furthermore, in the rubber composition of the present invention, it is preferable that the compound represented by the formula (III) is isophthalic acid dihydrazide. This is because more excellent low heat generation and wear resistance can be realized.

  Furthermore, in the rubber composition of the present invention, at least one of the fatty acid metal salts is preferably fatty acid zinc, and the content of the fatty acid zinc in the fatty acid metal salt is 50% by mass or more. More preferred. This is because better workability can be realized.

  Moreover, about the rubber composition of this invention, it is preferable that content of the said fatty acid metal salt is 0.1-5 mass parts with respect to 100 mass parts of said rubber components. This is because more excellent workability can be realized while suppressing a decrease in strength and wear resistance.

The tire of the present invention is characterized by using the rubber composition described above.
By providing the above configuration, it is possible to realize excellent low heat generation, wear resistance, and productivity.

  According to the present invention, it is possible to provide a rubber composition excellent in low heat buildup, wear resistance and processability. Further, according to the present invention, it is possible to provide a tire excellent in low heat generation, wear resistance, and productivity.

（式中、Ｒは、アリール基、置換若しくは無置換のヒダントイン基及び炭素数が１〜２０の飽和若しくは不飽和の直鎖状炭化水素基からなる群より選択される少なくとも一種である。） Hereinafter, embodiments of the present invention will be specifically described.
<Rubber composition>
The rubber composition of the present invention is a rubber composition containing a rubber component, a filler, a compound represented by the following formula (III), and a fatty acid metal salt.

(In the formula, R is at least one selected from the group consisting of an aryl group, a substituted or unsubstituted hydantoin group, and a saturated or unsaturated linear hydrocarbon group having 1 to 20 carbon atoms.)

(Rubber component)
The rubber component contained in the rubber composition of the present invention contains a diene rubber. By containing the diene rubber, it is possible to improve the wear resistance of the rubber composition.
Examples of the diene rubber include natural rubber, polybutadiene rubber (BR), polyisoprene rubber (IR), styrene / butadiene copolymer rubber (SBR), styrene isoprene butadiene rubber (SIBR), and chloroprene rubber (CR). And synthetic diene rubbers such as acrylonitrile butadiene rubber (NBR). Among these, at least natural rubber is preferably included. This is because more excellent low heat generation can be realized, and further improvement in wear resistance can be expected.
In addition, about the said diene type rubber | gum, you may contain individually by 1 type and may contain as 2 or more types of blends.

  In addition to the above-described diene rubber, the rubber component is a non-diene system such as ethylene propylene diene rubber (EPDM), ethylene propylene rubber (EPM), and butyl rubber (IIR) as long as the effects of the invention are not impaired. It is also possible to include synthetic rubber.

  The content of the diene rubber in the rubber component is not particularly limited, but is preferably 80% by mass or more from the viewpoint of maintaining excellent low heat buildup and wear resistance, and 90% by mass. % Or more is more preferable.

(Filler)
The rubber composition of the present invention includes a filler in addition to the rubber component described above.
By including the filler together with the rubber component and the compound represented by the formula (III) described later, the dispersibility of the filler is increased, and while maintaining the performance such as strength and wear resistance at a high level, the filler Even if it contains, the outstanding low exothermic property is realizable.

  Here, although content of the said filler is not specifically limited, It is preferable that it is 10-160 mass parts with respect to 100 mass parts of said rubber components, and it is more preferable that it is 30-100 mass parts. preferable. By optimizing the amount of filler, it is possible to achieve more excellent low heat generation and wear resistance, and when the content is 10 parts by mass or more, sufficient wear resistance is obtained, When the content is 160 parts by mass or less, it is possible to suppress the deterioration of low heat generation.

Further, the type of the filler is not particularly limited. For example, carbon black, silica, and other inorganic fillers can be included. Among these, it is preferable that the said filler contains carbon black. This is because more excellent low heat generation can be realized, and improvement in wear resistance can be expected.
Examples of the carbon black include GPF, FEF, SRF, HAF, ISAF, IISAF, and SAF grade carbon black.

  In addition, the content of the carbon black is preferably 10 parts by mass or more and more preferably 30 parts by mass or more with respect to 100 parts by mass of the rubber component from the viewpoint of obtaining superior wear resistance. Preferably, it is 50 parts by mass or more. This is because the wear resistance of the rubber composition can be further improved by setting the carbon black content to 10 parts by mass or more with respect to 100 parts by mass of the rubber component. Further, the content of the carbon black is preferably 160 parts by mass or less, more preferably 90 parts by mass or less, and further preferably 70 parts by mass or less with respect to 100 parts by mass of the rubber component. preferable. This is because when the content of the carbon black is 160 parts by mass or less with respect to 100 parts by mass of the rubber component, low heat build-up and workability can be further improved while maintaining the wear resistance at a high level. .

The silica as the filler is not particularly limited, and for example, wet silica, dry silica, colloidal silica, and the like can be used.
Moreover, as said other inorganic filler, it is also possible to use the inorganic compound represented, for example by following formula (A).
nM · xSiO _Y · zH ₂ O (A)
Wherein M is a metal selected from the group consisting of Al, Mg, Ti, Ca and Zr, oxides or hydroxides of these metals, and hydrates thereof, and carbonates of these metals. And n, x, y, and z are each an integer of 1 to 5, an integer of 0 to 10, an integer of 2 to 5, and an integer of 0 to 10).

Examples of the inorganic compound of the above formula (A) include alumina (Al ₂ O ₃ ) such as γ-alumina and α-alumina; alumina monohydrate such as boehmite and diaspore (Al ₂ O ₃ .H ₂ O); gibbsite Aluminum hydroxide [Al (OH) ₃ ], such as bayerite; aluminum carbonate [Al ₂ (CO ₃ ) ₃ ], magnesium hydroxide [Mg (OH) ₂ ], magnesium oxide (MgO), magnesium carbonate (MgCO ₃ ), Talc (3MgO · 4SiO ₂ · H ₂ O), attapulgite (5MgO · 8SiO ₂ · 9H ₂ O), titanium white (TiO ₂ ), titanium black (TiO _2n-1 ), calcium oxide (CaO), hydroxide Calcium [Ca (OH) ₂ ], aluminum magnesium oxide (MgO.Al ₂ O ₃ ), clay (Al ₂ O ₃ .2SiO ₂ ), kaolin (Al ₂ O ₃ .2Si) O ₂ · 2H ₂ O), pyrophyllite (Al ₂ O ₃ · 4SiO ₂ · H ₂ O), bentonite (Al ₂ O ₃ · 4SiO ₂ · 2H ₂ O), aluminum silicate (Al ₂ SiO ₅ , Al ₄ · 3SiO ₄ · 5H ₂ O), magnesium silicate (Mg ₂ SiO ₄ , MgSiO ₃ etc.), calcium silicate (Ca ₂ SiO ₄ etc.), aluminum calcium silicate (Al ₂ O ₃ · CaO · 2SiO ₂₎ Etc.), magnesium calcium silicate (CaMgSiO ₄ ), calcium carbonate (CaCO ₃ ), zirconium oxide (ZrO ₂ ), zirconium hydroxide [ZrO (OH) ₂ .nH ₂ O], zirconium carbonate [Zr (CO ₃ ) ₂ ], Crystalline aluminosilicates containing hydrogen, alkali metals or alkaline earth metals that correct the charge, such as various zeolites.

（式中、Ｒは、アリール基、置換若しくは無置換のヒダントイン基及び炭素数が１〜２０の飽和若しくは不飽和の直鎖状炭化水素基からなる群より選択される少なくとも一種である。）
これらの化合物を含むことで、ゴム組成物の低発熱性を改善することができる。 (Compound represented by Formula (III))
And the rubber composition of this invention contains the compound represented by Formula (III) shown below in addition to the rubber component and filler mentioned above.

(In the formula, R is at least one selected from the group consisting of an aryl group, a substituted or unsubstituted hydantoin group, and a saturated or unsaturated linear hydrocarbon group having 1 to 20 carbon atoms.)
By including these compounds, the low heat build-up of the rubber composition can be improved.

  The compound represented by the formula (III) has an action of suppressing an increase in viscosity while maintaining a low exothermic property of the rubber, and has a high affinity with the rubber component. By compounding, the chemical interaction between the rubber component and the filler can be greatly improved. As a result, the hysteresis loss due to the friction between the fillers can be reduced, and as a result, extremely excellent low heat generation can be obtained. In addition, better wear resistance can be achieved by improving the dispersibility of the filler.

  In the compound represented by the formula (III), R is an aryl group (which may be substituted at an ortho, meta, or para position), a substituted or unsubstituted hydantoin group, and a carbon number. It is at least one selected from the group consisting of 1 to 20 saturated or unsaturated linear hydrocarbon groups.

Here, examples of the aryl group represented by R include aromatic hydrocarbon groups such as a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, and a triphenylenyl group. Among them, a phenyl group is used. preferable.
Examples of the saturated or unsaturated linear hydrocarbon group having 1 to 20 carbon atoms include an ethylene group, a tetramethylene group, a heptamethylene group, and an octamethylene group.

  Specific compounds represented by the formula (III) include phthalic acid dihydrazide, isophthalic acid dihydrazide, terephthalic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, azelaic acid dihydrazide, sebacic acid dihydrazide, oxalic acid dihydrazide and dodecanoic acid. And dihydrazide. Of these compounds, isophthalic acid dihydrazide is preferably used from the viewpoint of ease of synthesis and further improvement in low heat build-up.

  Moreover, about melting | fusing point of the compound represented by said Formula (III), it is preferable that it is 80 degreeC or more and less than 250 degreeC, and it is more preferable that it is 80-200 degreeC. By lowering the melting point of the compound represented by the formula (III), the affinity with each molecule of the diene rubber is increased, more excellent heat build-up can be obtained, and the wear resistance is also improved. Because you can hope.

  In the rubber composition of the present invention, the content of the compound represented by the formula (III) is preferably 0.05 to 30 parts by mass with respect to 100 parts by mass of the rubber component. More preferably, it is 05-10 mass parts, and it is especially preferable that it is 0.05-5 mass parts. By making the content 0.05 parts by mass or more with respect to 100 parts by mass of the rubber component, more excellent low heat buildup and wear resistance can be obtained, and by making the content 30 parts by mass or less, workability can be improved. This is because deterioration can be prevented.

(Fatty acid metal salt)
The rubber composition of the present invention further includes a plurality of fatty acid metal salts each having a different metal type in addition to the rubber component, the filler, and the compound represented by the formula (III).
By including the compound represented by the formula (III), it has become possible to greatly improve the chemical interaction between the rubber component and the filler, but with this, a polymer gel is generated and the processability is improved. It was thought to get worse. Therefore, in the present invention, by further including a fatty acid metal salt as a processing aid in the rubber composition, it is possible to improve processability while maintaining a low exothermic property and wear resistance at an excellent level. It becomes possible. Furthermore, in the present invention, since the fatty acid metal salt contains a plurality of fatty acid metal salts each having a different metal type, only one of the workability and low heat build-up is improved, and the other is prevented from deteriorating. Therefore, processability and low exothermicity can be achieved at a high level.

  Here, the type of the fatty acid metal salt is not particularly limited as long as the type of metal is different, and a known fatty acid metal salt can be appropriately selected and used.

About the fatty acid of the said fatty acid metal salt, it is preferable to use a saturated or unsaturated fatty acid having 3 to 30, preferably 6 to 20 carbon atoms from the viewpoint of obtaining good processability. Examples thereof include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, carboxylic acid and the like.
In addition, about these fatty acid metal salts, you may use individually and can also use 2 or more types together.

  Further, the metal of the fatty acid metal salt is not particularly limited. As the metal, for example, it is preferable to use at least two selected from the group consisting of Na, K, Ca, Mg, Al and Zn, and at least one of them may use Zn (use fatty acid zinc). More preferred. This is because more excellent processability can be obtained.

  In addition, about content (total content) of the said fatty-acid metal salt, it is preferable that it is 0.1-5 mass parts with respect to 100 mass parts of said rubber components, and it is 0.5-3 mass parts. Is more preferable. By setting the content of the fatty acid metal salt to 0.1 parts by mass or more with respect to 100 parts by mass of the rubber component, it is possible to more reliably obtain an effect of improving workability, and the content of the fatty acid metal salt is By setting it as 5 mass parts or less with respect to 100 mass parts of rubber components, the fall of intensity | strength and abrasion resistance can be suppressed.

  Furthermore, when fatty acid zinc is included as the fatty acid metal salt, the content of the fatty acid zinc in the fatty acid metal salt is preferably 30% by mass or more, and more preferably 50% by mass or more. This is because the workability improvement effect can be obtained more reliably. Further, the content of the fatty acid zinc in the fatty acid metal salt is preferably 95% by mass or less, and more preferably 90% by mass or less in order not to deteriorate the low loss property.

(Other ingredients)
In addition to the rubber component, the filler, the compound represented by the formula (III) and the fatty acid metal salt, the rubber composition of the present invention contains a compounding agent commonly used in the rubber industry, such as anti-aging. An agent, a softening agent, a silane coupling agent, zinc white, a vulcanization accelerator, a vulcanizing agent, and the like can be appropriately selected and contained within a range that does not impair the object of the present invention. As these compounding agents, commercially available products can be suitably used.

  In addition, the manufacturing method of the rubber composition of this invention is not specifically limited. For example, a rubber component containing a diene rubber, a filler, a compound represented by the formula (III), a fatty acid metal salt, and other components optionally used are blended by a known method, It can be obtained by kneading.

<Tire>
The tire of the present invention is characterized by using the above-described rubber composition of the present invention. By including the rubber composition of the present invention excellent in low heat generation, wear resistance and processability as a tire material, excellent low heat generation, wear resistance and productivity can be realized.
The part to which the rubber composition is applied is not particularly limited, but is preferably used for a tread among tires. A tire using the rubber composition of the present invention for a tread is excellent in low heat buildup and wear resistance.
The tire of the present invention is not particularly limited except that the above-described rubber composition of the present invention is used for any tire member, and can be produced according to a conventional method. In addition, as a gas filled in the tire, an inert gas such as nitrogen, argon, helium, or the like can be used in addition to normal or air with adjusted oxygen partial pressure.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

<Example 1>
According to the component composition of Table 1, rubber composition samples 1 to 7 were prepared. In addition, about the compounding quantity of each component, it has shown by the mass part with respect to 100 mass parts of rubber components.
<Example 2>
According to the component composition of Table 2, samples of rubber compositions 8 to 12 were prepared. In addition, about the compounding quantity of each component, it has shown by the mass part with respect to 100 mass parts of rubber components.

<Evaluation>
The following evaluation was performed about the sample of the obtained rubber composition.
(1) Low exothermic property (tan δ index)
The rubber composition of each sample was vulcanized at 145 ° C. for 33 minutes to obtain a vulcanized rubber. The obtained vulcanized rubber was measured for loss tangent (tan δ) at a temperature of 50 ° C., a strain of 5%, and a frequency of 15 Hz using a viscoelasticity measuring device (manufactured by Rheometrics).
The measured tan δ is a reciprocal. In Table 1, the exponent value when the inverse value of tan δ of sample 3 is 100, and in Table 2, the exponent value when the inverse value of tan δ of sample 10 is 100. Indicated. About the obtained index value, it shows that it is excellent in low exothermic property, so that it is large. The evaluation results are shown in Tables 1 and 2.

(2) Wear resistance (wear index)
The rubber composition of each sample was vulcanized at 145 ° C. for 33 minutes to obtain a vulcanized rubber. A DIN abrasion test was performed in accordance with JIS-K6264-2: 2005 using a test piece cut out from each vulcanized rubber obtained in a disc shape (diameter 16.2 mm × thickness 6 mm), and DIN abrasion was performed at room temperature. The amount of wear (mm ³ ) during the test was measured.
In addition, about the abrasion amount measured in each sample, in Table 1, when the reciprocal number of the abrasion amount of the sample 3 is set to 100, in Table 2, each sample when the reciprocal number of the abrasion amount of the sample 10 is set to 100 The reciprocal of the amount of wear was indicated by an index. About the obtained index value, it shows that there are few abrasion amounts and abrasion resistance is so favorable that it is large. The evaluation results are shown in Tables 1 and 2.

(3) Processability evaluation (Mooney viscosity index)
The rubber composition of each sample was measured for Mooney viscosity according to JIS K 6300-1: 2001 (Mooney viscosity, Mooney scorch time).
Note that the measured Mooney viscosity was reciprocal. In Table 1, when the reciprocal value of Mooney viscosity of sample 3 is 100, the exponent value is 100, and in Table 2, the reciprocal value of Mooney viscosity of sample 10 is 100. It was expressed as an exponent value. About the obtained index value, it shows that unvulcanized viscosity is so small that workability | operativity is favorable. The evaluation results are shown in Tables 1 and 2.

(4) Total of evaluation values The total of the index values obtained by evaluations (1) to (3) was calculated. The calculation results are shown in Tables 1 and 2.

融点：１４６℃
¹Ｈ−ＮＭＲ（ＤＭＳＯ）： ０．９０（ｍ，６Ｈ）、１．９３（ｓ，３Ｈ）、２．００（ｍ，１Ｈ）、２．１７（ｍ，２Ｈ）、７．３８（ｍ，２Ｈ）、７．４６（ｍ，１Ｈ）、７．７５（ｍ，１Ｈ）、７．９５（ｍ，１Ｈ）、８．５８（ｍ，１Ｈ）、１１．１５（ｂ，１Ｈ）、１１．６５（ｂ，１Ｈ） * 1: RSS # 1
* 2: “# 80” manufactured by Asahi Carbon Co., Ltd.
* 3: 3-Hydroxy-2-naphthoic acid hydrazide, manufactured by Tokyo Chemical Industry Co., Ltd.
* 4: Isophthalic acid dihydrazide, manufactured by Tokyo Chemical Industry Co., Ltd., applicable to the compound represented by formula (III)
* 5: “A / O MIX” manufactured by Sankyo Oil Chemical Co., Ltd.
* 6: 2,2,4-trimethyl-1,2-dihydroquinoline polymer, “NOCRACK 224” manufactured by Ouchi Shinsei Chemical Co., Ltd.
* 7: N-tert-butyl-2-benzothiazolylsulfenamide, “Suncellor NS” manufactured by Sanshin Chemical Industry Co., Ltd.
* 8: N-cyclohexyl-2-benzothiazolesulfenamide, “Suncellor CM” manufactured by Sanshin Chemical Industry Co., Ltd.
* 9: Fatty acid metal salt A is “sodium stearate”, fatty acid metal salt B is “potassium stearate”, fatty acid metal salt C is “calcium stearate”, fatty acid metal salt D is “magnesium stearate”, fatty acid metal salt E “Aluminum stearate” and fatty acid metal salt F “Zinc stearate”, both manufactured by Tokyo Chemical Industry Co., Ltd.
* 10: As the modified butadiene rubber, one obtained by the following polymerization method was used.
In a pressure-resistant glass container having an internal volume of about 900 ml that has been dried and purged with nitrogen, 283 g of cyclohexane, 50 g of 1,3-butadiene monomer, 0.0057 mmol of 2,2-ditetrahydrofurylpropane, and 0.513 mmol of hexamethyleneimine are each added to cyclohexane. The solution was injected as a solution, 0.57 mmol of n-butyllithium (BuLi) was added thereto, and then polymerization was performed in a 50 ° C. warm water bath equipped with a stirrer for 4.5 hours. The polymerization conversion was almost 100%. To this polymerization system, 0.100 mmol of tin tetrachloride was added as a cyclohexane solution and stirred at 50 ° C. for 30 minutes. Thereafter, 0.5 ml of a 5% isopropanol solution of 2,6-di-t-butylparacresol (BHT) was added to stop the reaction, and further dried according to a conventional method to obtain a modified butadiene rubber. The amount of vinyl bonds in the butadiene portion was 14%, and the coupling efficiency was 65%.
* 11: 3-Hydroxy-N ′-(4-methylpentane-2-ylidene) naphthalene-2-carbohydrazide produced under the following conditions was added to a reactor equipped with a Dean-Stark reflux condenser and a stirrer. After charging 500 ml of isobutyl ketone and 50.5 g (0.25 mol) of 3-hydroxy-2-naphthoic acid hydrazide, the mixture was heated and refluxed for 5 hours while removing distilled water. After the reaction solution was cooled to 20 ° C., the precipitated crystals were separated by filtration, dried under reduced pressure, and pale yellow crystals of 3-hydroxy-N ′-(4-methylpentane-2-ylidene) naphthalene-2-carbohydrazide ( (Corresponding to the compound represented by the formula (II)) was obtained (67.6 g, yield 95%).

Melting point: 146 ° C
¹ H-NMR (DMSO): 0.90 (m, 6H), 1.93 (s, 3H), 2.00 (m, 1H), 2.17 (m, 2H), 7.38 (m, 2H), 7.46 (m, 1H), 7.75 (m, 1H), 7.95 (m, 1H), 8.58 (m, 1H), 11.15 (b, 1H), 11. 65 (b, 1H)

  From the results shown in Tables 1 and 2, the samples of each of the present invention samples have a higher overall evaluation and excellent balance of the evaluation items than the samples of the respective comparative examples, and workability, low heat build-up, and wear resistance. Can be seen at a high level.

  According to the present invention, it is possible to provide a rubber composition excellent in low heat buildup, wear resistance and processability. Further, according to the present invention, it is possible to provide a tire excellent in low heat generation, wear resistance, and productivity.

Claims (9)

A rubber component containing a diene rubber;
Filling material,
A compound represented by the following formula (III):
A rubber composition comprising a plurality of fatty acid metal salts each having a different metal type.

(In the formula, R is at least one selected from the group consisting of an aryl group, a substituted or unsubstituted hydantoin group, and a saturated or unsaturated linear hydrocarbon group having 1 to 20 carbon atoms.)   The rubber composition according to claim 1, wherein R in the compound represented by the formula (III) is a phenyl group.   The rubber composition according to claim 1 or 2, wherein the compound represented by the formula (III) has a melting point of 80 ° C or higher and lower than 250 ° C.   Content of the compound represented by said Formula (III) is 0.05-30 mass parts with respect to 100 mass parts of said rubber components, The any one of Claims 1-3 characterized by the above-mentioned. The rubber composition as described in 2.   The rubber composition according to claim 1, wherein the compound represented by the formula (III) is isophthalic acid dihydrazide.   The rubber composition according to any one of claims 1 to 5, wherein at least one of the fatty acid metal salts is zinc fatty acid.   The rubber composition according to claim 6, wherein a content of the fatty acid zinc in the fatty acid metal salt is 50% by mass or more.   8. The rubber composition according to claim 1, wherein a content of the fatty acid metal salt is 0.1 to 5 parts by mass with respect to 100 parts by mass of the rubber component.   A tire comprising the rubber composition according to any one of claims 1 to 8.